I already know how to turn on the television. You would use the present perfect to express something that happened previously, without specifying the time. What is the correct usage of phrase you don't know what you don't know?
'know of' is used when you have personal. However, i am having trouble figuring out why (or whether) this is the correct way to write the sentence,. Recently one of my friends told me that there is distinct difference between 'know of something' and 'know about something' expressions.
Possibly, i do know that can in fact only be used, when, you are answering the question of whether or not you know the issue at hand (or your knowledge has been called in. Please let me know as soon as you figure it out. It's not just you that don't know. In (2), however, the object of.
Can it be used in formal conversation/writing? Why would you have a problem with this? I know how to drive a car. Alright, well, for example, like on saturdays, y’know, what i liked to do.
I know (about) this difficulty/problem. I saw this sentence in the book 1q84: